/Engine/Plugins/Runtime/MeshModelingToolset/Source/MeshModelingTools/Public/EditMeshPolygonsTool.h
enum EEditMeshPolygonsToolActions { NoAction, AcceptCurrent, CancelCurrent, Extrude, PushPull, Offset, Inset, Outset, BevelFaces, InsertEdge, InsertEdgeLoop, Complete, PlaneCut, Merge, Delete, CutFaces, RecalculateNormals, FlipNormals, Retriangulate, Decompose, Disconnect, Duplicate, CollapseEdge, WeldEdges, StraightenEdge, FillHole, BridgeEdges, BevelEdges, SimplifyAlongEdges, PlanarProjectionUV, SimplifyByGroups, RegenerateExtraCorners, PokeSingleFace, SplitSingleEdge, FlipSingleEdge, CollapseSingleEdge, BevelAuto, }